/*
 * Copyright (c) 2011-2012 CommonsWare, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.arateb.spatiatlas.util;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;

import org.spatialite.database.SQLiteDatabase;
import org.spatialite.database.SQLiteOpenHelper;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.Arrays;

public class SQLiteCursorLoader extends AbstractCursorLoader {
    SQLiteOpenHelper db = null;
    String rawQuery = null;
    String[] args = null;

    /**
     * Creates a fully-specified SQLiteCursorLoader. See
     * {@link SQLiteDatabase#rawQuery(SQLiteDatabase, String, String[])
     * SQLiteDatabase.rawQuery()} for documentation on the meaning of the
     * parameters. These will be passed as-is to that call.
     */
    public SQLiteCursorLoader(Context context, SQLiteOpenHelper db,
                              String rawQuery, String[] args) {
        super(context);
        this.db = db;
        this.rawQuery = rawQuery;
        this.args = args;
    }

    /**
     * Runs on a worker thread and performs the actual database query to retrieve
     * the Cursor.
     */
    @Override
    protected Cursor buildCursor() {
        return (db.getReadableDatabase().rawQuery(rawQuery, args));
    }

    /**
     * Writes a semi-user-readable roster of contents to supplied output.
     */
    @Override
    public void dump(String prefix, FileDescriptor fd, PrintWriter writer,
                     String[] args) {
        super.dump(prefix, fd, writer, args);
        writer.print(prefix);
        writer.print("rawQuery=");
        writer.println(rawQuery);
        writer.print(prefix);
        writer.print("args=");
        writer.println(Arrays.toString(args));
    }

    public void insert(String table, String nullColumnHack, ContentValues values) {
        new InsertTask(this).execute(db, table, nullColumnHack, values);
    }

    public void update(String table, ContentValues values, String whereClause,
                       String[] whereArgs) {
        new UpdateTask(this).execute(db, table, values, whereClause, whereArgs);
    }

    public void replace(String table, String nullColumnHack, ContentValues values) {
        new ReplaceTask(this).execute(db, table, nullColumnHack, values);
    }

    public void delete(String table, String whereClause, String[] whereArgs) {
        new DeleteTask(this).execute(db, table, whereClause, whereArgs);
    }

    public void execSQL(String sql, Object[] bindArgs) {
        new ExecSQLTask(this).execute(db, sql, bindArgs);
    }

    private class InsertTask extends ContentChangingTask<Object, Void, Void> {
        InsertTask(SQLiteCursorLoader loader) {
            super(loader);
        }

        @Override
        protected Void doInBackground(Object... params) {
            SQLiteOpenHelper db = (SQLiteOpenHelper) params[0];
            String table = (String) params[1];
            String nullColumnHack = (String) params[2];
            ContentValues values = (ContentValues) params[3];

            db.getWritableDatabase().insert(table, nullColumnHack, values);

            return (null);
        }
    }

    private class UpdateTask extends ContentChangingTask<Object, Void, Void> {
        UpdateTask(SQLiteCursorLoader loader) {
            super(loader);
        }

        @Override
        protected Void doInBackground(Object... params) {
            SQLiteOpenHelper db = (SQLiteOpenHelper) params[0];
            String table = (String) params[1];
            ContentValues values = (ContentValues) params[2];
            String where = (String) params[3];
            String[] whereParams = (String[]) params[4];

            db.getWritableDatabase().update(table, values, where, whereParams);

            return (null);
        }
    }

    private class ReplaceTask extends ContentChangingTask<Object, Void, Void> {
        ReplaceTask(SQLiteCursorLoader loader) {
            super(loader);
        }

        @Override
        protected Void doInBackground(Object... params) {
            SQLiteOpenHelper db = (SQLiteOpenHelper) params[0];
            String table = (String) params[1];
            String nullColumnHack = (String) params[2];
            ContentValues values = (ContentValues) params[3];

            db.getWritableDatabase().replace(table, nullColumnHack, values);

            return (null);
        }
    }

    private class DeleteTask extends ContentChangingTask<Object, Void, Void> {
        DeleteTask(SQLiteCursorLoader loader) {
            super(loader);
        }

        @Override
        protected Void doInBackground(Object... params) {
            SQLiteOpenHelper db = (SQLiteOpenHelper) params[0];
            String table = (String) params[1];
            String where = (String) params[2];
            String[] whereParams = (String[]) params[3];

            db.getWritableDatabase().delete(table, where, whereParams);

            return (null);
        }
    }

    private class ExecSQLTask extends ContentChangingTask<Object, Void, Void> {
        ExecSQLTask(SQLiteCursorLoader loader) {
            super(loader);
        }

        @Override
        protected Void doInBackground(Object... params) {
            SQLiteOpenHelper db = (SQLiteOpenHelper) params[0];
            String sql = (String) params[1];
            Object[] bindParams = (Object[]) params[2];

            db.getWritableDatabase().execSQL(sql, bindParams);

            return (null);
        }
    }
}